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Eva Degerman

Eva Degerman

Professor

Eva Degerman

Protein kinase B is expressed in pancreatic beta cells and activated upon stimulation with insulin-like growth factor I

Author

  • Lena Stenson
  • Hindrik Mulder
  • V Manganiello
  • Frank Sundler
  • Bo Ahrén
  • Cecilia Holm
  • Eva Degerman

Summary, in English

Protein kinase B (PKB) is involved in signaling to a multitude of important cellular events and is activated by insulin and growth factors, including insulin-like growth factor I (IGF-I). We show here expression of PKB in pancreatic islets and in the beta cell lines HIT-T15, INS-1, and RINm5F. Expression of PKB mRNA and the presence of PKB isoforms (alpha, beta, and gamma) were assessed by Northern blot analysis and RT-PCR, respectively. Antibodies recognizing different parts of PKB isoforms were employed to demonstrate PKB protein expression by immunoblot analysis. By use of immunohistochemistry in rat and mouse pancreatic tissue sections, PKB was localized to predominantly beta cells. Regulation of PKB was examined in INS-1 and RINm5F cells; upon stimulation with IGF-I (5-10 min), PKB was phosphorylated and activated (approximately 3-fold) by a wortmannin-sensitive mechanism, indicating involvement of phosphatidylinositol-3 kinase. The possible participation of PKB in signal transduction pathways modulating cAMP-dependent insulin secretion and in proliferation of beta cells is discussed.

Department/s

  • Insulin Signal Transduction
  • Department of Experimental Medical Science
  • Medicine, Lund
  • Molecular Endocrinology

Publishing year

1998

Language

English

Pages

181-186

Publication/Series

Biochemical and Biophysical Research Communications

Volume

250

Issue

1

Document type

Journal article

Publisher

Elsevier

Topic

  • Biological Sciences

Status

Published

Research group

  • Insulin Signal Transduction
  • Molecular Endocrinology

ISBN/ISSN/Other

  • ISSN: 1090-2104